Sewing machine



FIG. 1 is a front perspective view of an embodiment of a sewing machine showing my new design;

FIG. 2 is a top plan view of the sewing machine shown in FIG. 1;

FIG. 3 is a front view of the sewing machine shown in FIG. 1;

FIG. 4 is a lefthand side view of the sewing machine shown in FIG. 1;

FIG. 5 is a righthand side view of the sewing machine shown in FIG. 1; and,

FIG. 6 is a rear view of the sewing machine shown in FIG. 1. 

I claim the ornamental design for a sewing machine, as shown and described. 